import java.util.Arrays;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
import java.util.TreeSet;
import java.util.Map;
import java.util.HashMap;

import com.teamtreehouse.Treet;
import com.teamtreehouse.Treets;


public class Example {

  public static void main(String[] args) {
    Treet[] treets = Treets.load();
    System.out.printf("There are %d treets. %n",
                     treets.length);
    Set<String> allHashTags = new HashSet<String>();
    Set<String> allMentions = new TreeSet<String>();
    for (Treet treet : treets) {
      allHashTags.addAll(treet.getHashTags());
      allMentions.addAll(treet.getMentions());
    }
    System.out.printf("Hash tags: %s %n", allHashTags);
    System.out.printf("Mentions: %s %n", allMentions);
  }

  Map<String, Integer> hashTagCounts = new HashMap<String, Integer>();
  for (Treet treet : treets) {
    for (String hashTag : treet.getHashTags()) {
      Integer count = hashTagCounts.get(hashTag);
      if (count == null) {
        count = 0;
      }
      count++;
      hashTagCounts.put(hashTag, count);
    }
  }
  System.out.printf("Hash tag counts: %s %n", hashTagCounts);
}